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class="header-anchor">#</a> 写在前面</h2> <blockquote><p>最近，不少小伙伴在催更【Spring注解驱动开发】专题，好吧，【Spring注解驱动开发】专题确实有很长时间没更新了。那我们从今天开始更新【Spring注解驱动开发】专题，同样的，我们还是以源码解析为主。</p> <p>文章已同步收录到：https://github.com/sunshinelyz/technology-binghe 和 https://gitee.com/binghe001/technology-binghe 。如果文件对你有点帮助，别忘记给个Star哦！</p> <p>关注【冰河技术】微信公众号，回复“Spring注解”领取工程源码。</p></blockquote> <h2 id="类结构图"><a href="#类结构图" class="header-anchor">#</a> 类结构图</h2> <p>我们先来看下AnnotationAwareAspectJAutoProxyCreator类的结构图。</p> <p><img alt="013" data-src="https://binghe001.github.io/assets/images/core/spring/ioc/2022-04-04-038-001.png" loading="lazy" class="lazy"></p> <p>上图中一些 <strong>类/接口</strong> 的介绍：</p> <p><strong>AspectJAwareAdvisorAutoProxyCreator</strong> : 公开了AspectJ的调用上下文，并弄清楚来自同一切面的多个Advisor在AspectJ中的优先级规则。</p> <p><strong>AbstractAdvisorAutoProxyCreator</strong> : 通用自动代理创建器，它基于检测到的每个顾问程序为特定bean构建AOP代理。</p> <p><strong>AbstractAutoProxyCreator</strong> : 扩展了  ProxyProcessorSupport，实现了SmartInstantiationAwareBeanPostProcessor、BeanFactoryAware 接口，是BeanPostProcessor 实现，该实现使用AOP代理包装每个合格的bean，并在调用bean本身之前委派给指定的拦截器。</p> <p><strong>BeanFactoryAware</strong> : 实现了该接口的Bean可以知道它属于那个 BeanFactory，Bean可以通过Spring容器查找它的协同者（依赖查找），但大多数的Bean是通过构造器参数和Bean方法（依赖注入）来获取它的协同者。</p> <p><strong>BeanPostProcessor</strong> ：工厂钩子，允许自定义修改新的bean实例。例如，检查标记接口或使用代理包装bean。<strong>如果我们需要在Spring容器中完成Bean的实例化，配置和其初始化前后添加一些自己的逻辑处理，我们就可以定义一个或多个BeanPostProcessor接口的实现，然后注册到容器中。</strong></p> <p><strong>InstantiationAwareBeanPostProcessor</strong> : BeanPostProcessor  的子接口，它添加了实例化之前的回调，以及实例化之后但设置了显式属性或自动装配之前的回调。它内部提供了3个方法，再加上BeanPostProcessor接口内部的2个方法，实现这个接口需要实现5个方法。InstantiationAwareBeanPostProcessor 接口的主要作用在于目标对象的实例化过程中需要处理的事情，包括实例化对象的前后过程以及实例的属性设置。</p> <p><strong>SmartInstantiationAwareBeanPostProcessor</strong> : InstantiationAwareBeanPostProcessor 接口的扩展，多出了3个方法，添加了用于预测已处理bean的最终类型的回调，再加上父接口的5个方法，所以实现这个接口需要实现8个方法，主要作用也是在于目标对象的实例化过程中需要处理的事情。</p> <p>**总之：**AspectJAwareAdvisorAutoProxyCreator为 AspectJ 切面类创建自动代理。</p> <h2 id="核心类解析"><a href="#核心类解析" class="header-anchor">#</a> 核心类解析</h2> <p><strong>BeanPostProcessor</strong> 接口中的两个方法 postProcessBeforeInitialization 和 postProcessAfterInitialization，作用是对<strong>Bean初始化前后</strong>添加一些自己的逻辑。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">Object</span> <span class="token function">postProcessBeforeInitialization</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">Object</span> <span class="token function">postProcessAfterInitialization</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p><strong>InstantiationAwareBeanPostProcessor</strong> 是 <strong>BeanPostProcessor</strong> 的子接口，它额外增加了3个新的方法：postProcessBeforeInstantiation（ 目标对象被<strong>实例化之前</strong>调用的方法，可以返回目标实例的一个代理用来代替目标实例 ）、postProcessAfterInstantiation（该方法在Bean<strong>实例化之后</strong>执行，返回false，会忽略属性值的设置；如果返回true，会按照正常流程设置属性值） 和 postProcessPropertyValues（对属性值进行修改，未来版本将会删除）</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">Object</span> <span class="token function">postProcessBeforeInstantiation</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> beanClass<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">default</span> <span class="token keyword">boolean</span> <span class="token function">postProcessAfterInstantiation</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">PropertyValues</span> <span class="token function">postProcessPropertyValues</span><span class="token punctuation">(</span>
    <span class="token class-name">PropertyValues</span> pvs<span class="token punctuation">,</span> <span class="token class-name">PropertyDescriptor</span><span class="token punctuation">[</span><span class="token punctuation">]</span> pds<span class="token punctuation">,</span> <span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> pvs<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p><strong>SmartInstantiationAwareBeanPostProcessor</strong>接口继承InstantiationAwareBeanPostProcessor接口，里面定义了3个方法：predictBeanType（预测Bean的类型）、determineCandidateConstructors（选择合适的构造器）、getEarlyBeanReference（解决循环引用问题）。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> <span class="token function">predictBeanType</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> beanClass<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">default</span> <span class="token class-name">Constructor</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token function">determineCandidateConstructors</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> beanClass<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">default</span> <span class="token class-name">Object</span> <span class="token function">getEarlyBeanReference</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p><strong>AbstractAutoProxyCreator</strong> 是AOP的一个核心类，它实现了SmartInstantiationAwareBeanPostProcessor、BeanFactoryAware 接口，实现了代理创建的逻辑，使用AOP代理包装每个合格的bean，并在调用bean本身之前委派给指定的拦截器。</p> <p><strong>AbstractAdvisorAutoProxyCreator</strong> 通用自动代理创建器，它基于检测每个bean的增强器，为特殊的bean构建AOP代理。子类可以重写此findCandidateAdvisors()方法，以返回适用于任何对象的advisor的自定义列表，子类还可以重写继承的AbstractAutoProxyCreator.shouldSkip()方法，以将某些对象排除在自动代理之外。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> <span class="token function">findCandidateAdvisors</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
       <span class="token class-name">Assert</span><span class="token punctuation">.</span><span class="token function">state</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>advisorRetrievalHelper <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">&quot;No BeanFactoryAdvisorRetrievalHelper available&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>advisorRetrievalHelper<span class="token punctuation">.</span><span class="token function">findAdvisorBeans</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p><strong>AspectJAwareAdvisorAutoProxyCreator</strong> 扩展 AbstractAdvisorAutoProxyCreator，公开了AspectJ的调用上下文，并在多个增强器来自同一切面时搞清楚AspectJ的建议优先级顺序。按AspectJ优先级排序其余部分：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token annotation punctuation">@SuppressWarnings</span><span class="token punctuation">(</span><span class="token string">&quot;unchecked&quot;</span><span class="token punctuation">)</span>
<span class="token keyword">protected</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> <span class="token function">sortAdvisors</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> advisors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">PartiallyComparableAdvisorHolder</span><span class="token punctuation">&gt;</span></span> partiallyComparableAdvisors <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>advisors<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Advisor</span> element <span class="token operator">:</span> advisors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        partiallyComparableAdvisors<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>
            <span class="token keyword">new</span> <span class="token class-name">PartiallyComparableAdvisorHolder</span><span class="token punctuation">(</span>element<span class="token punctuation">,</span> DEFAULT_PRECEDENCE_COMPARATOR<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">PartiallyComparableAdvisorHolder</span><span class="token punctuation">&gt;</span></span> sorted <span class="token operator">=</span> <span class="token class-name">PartialOrder</span><span class="token punctuation">.</span><span class="token function">sort</span><span class="token punctuation">(</span>partiallyComparableAdvisors<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>sorted <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> result <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>advisors<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">PartiallyComparableAdvisorHolder</span> pcAdvisor <span class="token operator">:</span> sorted<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            result<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>pcAdvisor<span class="token punctuation">.</span><span class="token function">getAdvisor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> result<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">sortAdvisors</span><span class="token punctuation">(</span>advisors<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><p>在增强链头部增加一个ExposeInvocationInterceptor，使用AspectJ表达式切入点和使用AspectJ样式的advisor时，需要这些附加advisor。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">extendAdvisors</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> candidateAdvisors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token class-name">AspectJProxyUtils</span><span class="token punctuation">.</span><span class="token function">makeAdvisorChainAspectJCapableIfNecessary</span><span class="token punctuation">(</span>candidateAdvisors<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>如果此后处理器不应该考虑将给定的bean用于自动代理，子类应重写此方法以返回true</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">protected</span> <span class="token keyword">boolean</span> <span class="token function">shouldSkip</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> beanClass<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// TODO: Consider optimization by caching the list of the aspect names</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Advisor</span><span class="token punctuation">&gt;</span></span> candidateAdvisors <span class="token operator">=</span> <span class="token function">findCandidateAdvisors</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Advisor</span> advisor <span class="token operator">:</span> candidateAdvisors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>advisor <span class="token keyword">instanceof</span> <span class="token class-name">AspectJPointcutAdvisor</span> <span class="token operator">&amp;&amp;</span>
            <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">AspectJPointcutAdvisor</span><span class="token punctuation">)</span> advisor<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAspectName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">shouldSkip</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p><strong>AspectJAwareAdvisorAutoProxyCreator</strong> 还有一个子类叫 <strong>AnnotationAwareAspectJAutoProxyCreator</strong>，子类AnnotationAwareAspectJAutoProxyCreator是用于处理当前应用程序上下文中的所有AspectJ注释方面以及Spring Advisor。如果Spring  AOP的基于代理的模型能够应用任何AspectJ注释的类，它们的advisor将被自动识别，这涵盖了方法执行连接点，Spring  Advisor的处理遵循AbstractAdvisorAutoProxyCreator中建立的规则。</p> <h2 id="生成代理对象"><a href="#生成代理对象" class="header-anchor">#</a> 生成代理对象</h2> <p>从使用<a href="aop:xxx">aop:xxx</a>标签来自动生成代理的话，先看看AopNamespaceHandler，使用<a href="aop:config">aop:config</a>标签则使用 ConfigBeanDefinitionParser 解析，使用了<a href="aop:aspectj-autoproxy">aop:aspectj-autoproxy</a>标签则使用 AspectJAutoProxyBeanDefinitionParser 解析，依次类推。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// In 2.0 XSD as well as in 2.1 XSD.</span>
    <span class="token function">registerBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token string">&quot;config&quot;</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ConfigBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">registerBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token string">&quot;aspectj-autoproxy&quot;</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">AspectJAutoProxyBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">registerBeanDefinitionDecorator</span><span class="token punctuation">(</span><span class="token string">&quot;scoped-proxy&quot;</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ScopedProxyBeanDefinitionDecorator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token comment">// Only in 2.0 XSD: moved to context namespace as of 2.1</span>
    <span class="token function">registerBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token string">&quot;spring-configured&quot;</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">SpringConfiguredBeanDefinitionParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><ul><li><a href="aop:config">aop:config</a>方式使用 AspectJAwareAdvisorAutoProxyCreator 创建代理</li> <li><a href="aop:aspectj-autoproxy">aop:aspectj-autoproxy</a>使用 AnnotationAwareAspectJAutoProxyCreator 创建代理</li></ul> <p>ConfigBeanDefinitionParser.java</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">public</span> <span class="token class-name">BeanDefinition</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token class-name">Element</span> element<span class="token punctuation">,</span> <span class="token class-name">ParserContext</span> parserContext<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">CompositeComponentDefinition</span> compositeDef <span class="token operator">=</span>
        <span class="token keyword">new</span> <span class="token class-name">CompositeComponentDefinition</span><span class="token punctuation">(</span>element<span class="token punctuation">.</span><span class="token function">getTagName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> parserContext<span class="token punctuation">.</span><span class="token function">extractSource</span><span class="token punctuation">(</span>element<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    parserContext<span class="token punctuation">.</span><span class="token function">pushContainingComponent</span><span class="token punctuation">(</span>compositeDef<span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token function">configureAutoProxyCreator</span><span class="token punctuation">(</span>parserContext<span class="token punctuation">,</span> element<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 注册AspectJAwareAdvisorAutoProxyCreator</span>

    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Element</span><span class="token punctuation">&gt;</span></span> childElts <span class="token operator">=</span> <span class="token class-name">DomUtils</span><span class="token punctuation">.</span><span class="token function">getChildElements</span><span class="token punctuation">(</span>element<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Element</span> elt<span class="token operator">:</span> childElts<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">String</span> localName <span class="token operator">=</span> parserContext<span class="token punctuation">.</span><span class="token function">getDelegate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getLocalName</span><span class="token punctuation">(</span>elt<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>POINTCUT<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parsePointcut</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ADVISOR<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parseAdvisor</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ASPECT<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parseAspect</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    parserContext<span class="token punctuation">.</span><span class="token function">popAndRegisterContainingComponent</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">configureAutoProxyCreator</span><span class="token punctuation">(</span><span class="token class-name">ParserContext</span> parserContext<span class="token punctuation">,</span> <span class="token class-name">Element</span> element<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">AopNamespaceUtils</span><span class="token punctuation">.</span><span class="token function">registerAspectJAutoProxyCreatorIfNecessary</span><span class="token punctuation">(</span>parserContext<span class="token punctuation">,</span> element<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><p>AopConfigUtils.java</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">public</span> <span class="token class-name">BeanDefinition</span> <span class="token function">parse</span><span class="token punctuation">(</span><span class="token class-name">Element</span> element<span class="token punctuation">,</span> <span class="token class-name">ParserContext</span> parserContext<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">CompositeComponentDefinition</span> compositeDef <span class="token operator">=</span>
        <span class="token keyword">new</span> <span class="token class-name">CompositeComponentDefinition</span><span class="token punctuation">(</span>element<span class="token punctuation">.</span><span class="token function">getTagName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> parserContext<span class="token punctuation">.</span><span class="token function">extractSource</span><span class="token punctuation">(</span>element<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    parserContext<span class="token punctuation">.</span><span class="token function">pushContainingComponent</span><span class="token punctuation">(</span>compositeDef<span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token function">configureAutoProxyCreator</span><span class="token punctuation">(</span>parserContext<span class="token punctuation">,</span> element<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 注册AspectJAwareAdvisorAutoProxyCreator</span>

    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Element</span><span class="token punctuation">&gt;</span></span> childElts <span class="token operator">=</span> <span class="token class-name">DomUtils</span><span class="token punctuation">.</span><span class="token function">getChildElements</span><span class="token punctuation">(</span>element<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Element</span> elt<span class="token operator">:</span> childElts<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">String</span> localName <span class="token operator">=</span> parserContext<span class="token punctuation">.</span><span class="token function">getDelegate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getLocalName</span><span class="token punctuation">(</span>elt<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>POINTCUT<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parsePointcut</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ADVISOR<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parseAdvisor</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ASPECT<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>localName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">parseAspect</span><span class="token punctuation">(</span>elt<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    parserContext<span class="token punctuation">.</span><span class="token function">popAndRegisterContainingComponent</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">configureAutoProxyCreator</span><span class="token punctuation">(</span><span class="token class-name">ParserContext</span> parserContext<span class="token punctuation">,</span> <span class="token class-name">Element</span> element<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">AopNamespaceUtils</span><span class="token punctuation">.</span><span class="token function">registerAspectJAutoProxyCreatorIfNecessary</span><span class="token punctuation">(</span>parserContext<span class="token punctuation">,</span> element<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><p>AopConfigUtils.java</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">registerAspectJAutoProxyCreatorIfNecessary</span><span class="token punctuation">(</span>
    <span class="token class-name">ParserContext</span> parserContext<span class="token punctuation">,</span> <span class="token class-name">Element</span> sourceElement<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 在这里注册的是AspectJAwareAdvisorAutoProxyCreator</span>
    <span class="token class-name">BeanDefinition</span> beanDefinition <span class="token operator">=</span> <span class="token class-name">AopConfigUtils</span><span class="token punctuation">.</span><span class="token function">registerAspectJAutoProxyCreatorIfNecessary</span><span class="token punctuation">(</span>
        parserContext<span class="token punctuation">.</span><span class="token function">getRegistry</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> parserContext<span class="token punctuation">.</span><span class="token function">extractSource</span><span class="token punctuation">(</span>sourceElement<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">useClassProxyingIfNecessary</span><span class="token punctuation">(</span>parserContext<span class="token punctuation">.</span><span class="token function">getRegistry</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> sourceElement<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">registerComponentIfNecessary</span><span class="token punctuation">(</span>beanDefinition<span class="token punctuation">,</span> parserContext<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 注册组件</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Nullable</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">BeanDefinition</span> <span class="token function">registerAspectJAutoProxyCreatorIfNecessary</span><span class="token punctuation">(</span>
    <span class="token class-name">BeanDefinitionRegistry</span> registry<span class="token punctuation">,</span> <span class="token annotation punctuation">@Nullable</span> <span class="token class-name">Object</span> source<span class="token punctuation">)</span> <span class="token punctuation">{</span>

    <span class="token keyword">return</span> <span class="token function">registerOrEscalateApcAsRequired</span><span class="token punctuation">(</span><span class="token class-name">AspectJAwareAdvisorAutoProxyCreator</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> registry<span class="token punctuation">,</span> source<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p><strong>AspectJAwareAdvisorAutoProxyCreator</strong> 实现了 <strong>BeanPostProcessor</strong> 等上面介绍的接口，主要作用于Bean初始化前后，实例化前后，所有的Bean都被作用到。<strong>InstantiationAwareBeanPostProcessor</strong> 是 <strong>BeanPostProcessor</strong>的子接口，但它的调用时间点发生在Bean实例化前，在真正调用doCreateBean()创建bean实例之前执行postProcessBeforeInstantiation()。</p> <p>AbstractAutoProxyCreator.java</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">postProcessBeforeInstantiation</span><span class="token punctuation">(</span><span class="token class-name">Class</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span><span class="token punctuation">&gt;</span></span> beanClass<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token class-name">Object</span> cacheKey <span class="token operator">=</span> <span class="token function">getCacheKey</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>　　<span class="token comment">// 得到一个缓存的唯一key（根据beanClass和beanName生成唯一key）</span>
    <span class="token comment">// 如果当前targetSourcedBeans（通过自定义TargetSourceCreator创建的TargetSource）不包含cacheKey</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">hasLength</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>targetSourcedBeans<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">containsKey</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>　　<span class="token comment">//advisedBeans（已经被增强的Bean，即AOP代理对象）中包含当前cacheKey，返回null，即走Spring默认流程</span>
            <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isInfrastructureClass</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token function">shouldSkip</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">// 如果是基础设施类（如Advisor、Advice、AopInfrastructureBean的实现）不进行处理;（略）</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span>FALSE<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// 如果有自定义的TargetSource，在此处创建代理</span>
    <span class="token comment">// 禁止目标Bean的不必要的默认实例化：</span>
    <span class="token comment">// TargetSource将以自定义方式处理目标实例。</span>
    <span class="token class-name">TargetSource</span> targetSource <span class="token operator">=</span> <span class="token function">getCustomTargetSource</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>targetSource <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">hasLength</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>targetSourcedBeans<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> specificInterceptors <span class="token operator">=</span> <span class="token function">getAdvicesAndAdvisorsForBean</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> targetSource<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">Object</span> proxy <span class="token operator">=</span> <span class="token function">createProxy</span><span class="token punctuation">(</span>beanClass<span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> specificInterceptors<span class="token punctuation">,</span> targetSource<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>proxyTypes<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> proxy<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> proxy<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><p>通过 AbstractAutoProxyCreator 中的 postProcessAfterInitialization() 创建AOP代理。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">postProcessAfterInitialization</span><span class="token punctuation">(</span><span class="token annotation punctuation">@Nullable</span> <span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">BeansException</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>bean <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">Object</span> cacheKey <span class="token operator">=</span> <span class="token function">getCacheKey</span><span class="token punctuation">(</span>bean<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>earlyProxyReferences<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>　　<span class="token comment">// 如果之前调用过getEarlyBeanReference获取包装目标对象到AOP代理对象（如果需要），则不再执行</span>
            <span class="token keyword">return</span> <span class="token function">wrapIfNecessary</span><span class="token punctuation">(</span>bean<span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> cacheKey<span class="token punctuation">)</span><span class="token punctuation">;</span>　　<span class="token comment">// 包装目标对象到AOP代理对象（如果需要）</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">protected</span> <span class="token class-name">Object</span> <span class="token function">wrapIfNecessary</span><span class="token punctuation">(</span><span class="token class-name">Object</span> bean<span class="token punctuation">,</span> <span class="token class-name">String</span> beanName<span class="token punctuation">,</span> <span class="token class-name">Object</span> cacheKey<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">hasLength</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>targetSourcedBeans<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span>beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// 通过TargetSourceCreator进行自定义TargetSource不需要包装</span>
        <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Boolean</span><span class="token punctuation">.</span>FALSE<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>　　<span class="token comment">// 不应该被增强对象不需要包装</span>
        <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isInfrastructureClass</span><span class="token punctuation">(</span>bean<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token function">shouldSkip</span><span class="token punctuation">(</span>bean<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> beanName<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// 基础设施或应该skip的不需要保证</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span>FALSE<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">// 如果有advise则创建代理。</span>
    <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> specificInterceptors <span class="token operator">=</span> <span class="token function">getAdvicesAndAdvisorsForBean</span><span class="token punctuation">(</span>bean<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>specificInterceptors <span class="token operator">!=</span> DO_NOT_PROXY<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span>TRUE<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">Object</span> proxy <span class="token operator">=</span> <span class="token function">createProxy</span><span class="token punctuation">(</span>
            bean<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> beanName<span class="token punctuation">,</span> specificInterceptors<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">SingletonTargetSource</span><span class="token punctuation">(</span>bean<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 创建代理对象</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>proxyTypes<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> proxy<span class="token punctuation">.</span><span class="token function">getClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> proxy<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span>advisedBeans<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>cacheKey<span class="token punctuation">,</span> <span class="token class-name">Boolean</span><span class="token punctuation">.</span>FALSE<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> bean<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br></div></div><p><strong>好了，今天就到这儿吧，我是冰河，我们下期见~~</strong></p> <h2 id="冰河原创pdf"><a href="#冰河原创pdf" class="header-anchor">#</a> 冰河原创PDF</h2> <p>关注 <strong>冰河技术</strong> 微信公众号：</p> <p>回复 “<strong>并发编程</strong>” 领取《深入理解高并发编程（第1版）》PDF文档。</p> <p>回复 “<strong>并发源码</strong>” 领取《并发编程核心知识（源码分析篇 第1版）》PDF文档。</p> <p>回复 ”<strong>限流</strong>“ 领取《亿级流量下的分布式解决方案》PDF文档。</p> <p>回复 “<strong>设计模式</strong>” 领取《深入浅出Java23种设计模式》PDF文档。</p> <p>回复 “<strong>Java8新特性</strong>” 领取 《Java8新特性教程》PDF文档。</p> <p>回复 “<strong>分布式存储</strong>” 领取《跟冰河学习分布式存储技术》 PDF文档。</p> <p>回复 “<strong>Nginx</strong>” 领取《跟冰河学习Nginx技术》PDF文档。</p> <p>回复 “<strong>互联网工程</strong>” 领取《跟冰河学习互联网工程技术》PDF文档。</p> <h2 id="重磅福利"><a href="#重磅福利" class="header-anchor">#</a> 重磅福利</h2> <p>微信搜一搜【冰河技术】微信公众号，关注这个有深度的程序员，每天阅读超硬核技术干货，公众号内回复【PDF】有我准备的一线大厂面试资料和我原创的超硬核PDF技术文档，以及我为大家精心准备的多套简历模板（不断更新中），希望大家都能找到心仪的工作，学习是一条时而郁郁寡欢，时而开怀大笑的路，加油。如果你通过努力成功进入到了心仪的公司，一定不要懈怠放松，职场成长和新技术学习一样，不进则退。如果有幸我们江湖再见！</p> <p>另外，我开源的各个PDF，后续我都会持续更新和维护，感谢大家长期以来对冰河的支持！！</p> <h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/core/spring/ioc/2022-04-04-038-AnnotationAwareAspectJAutoProxyCreator源码解析.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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